Authorization in ASP.NET Core. Always 401 Unauthorized for [Authorize] attribute

In my case I was following coreApi,angularClient tutorial, but getting unauthorized error every time also In my case angular application is running under Core Api project.

So then I changed the order like this and it works now

   public void Configure(IApplicationBuilder app, IHostingEnvironment env,ILoggerFactory loggerFactory)
    {

        if (env.IsDevelopment())
        {
            app.UseDeveloperExceptionPage();
        }
        else
        {
            app.UseExceptionHandler("/Error");
            app.UseHsts();
        }

        app.UseHttpsRedirection();
        app.UseStaticFiles();
        app.UseSpaStaticFiles();


        app.UseAuthentication();

        app.UseMvc(routes =>
        {
            routes.MapRoute(
                name: "default",
                template: "{controller}/{action=Index}/{id?}");
        });


        app.UseSpa(spa =>
        {
            // To learn more about options for serving an Angular SPA from ASP.NET Core,
            // see https://go.microsoft.com/fwlink/?linkid=864501

            spa.Options.SourcePath = "ClientApp";

            if (env.IsDevelopment())
            {
                spa.UseAngularCliServer(npmScript: "start");
            }
        });


         loggerFactory.AddConsole(Configuration.GetSection("Logging"));
        loggerFactory.AddDebug();

        // global cors policy
        app.UseCors(x => x
            .AllowAnyOrigin()
            .AllowAnyMethod()
            .AllowAnyHeader()
            .AllowCredentials());

    }

If you are using ASP.NET Core 3.0

Check this order

app.UseAuthentication();

app.UseRouting(); //must be below app.UseAuthentication();

If you are using ASP.NET Core < 3.0

Just replace the app.UseRouting(); by app.UseMvc();

i.e:

app.UseAuthentication();

app.UseMvc(); //must be below app.UseAuthentication();

in ASP.NET Core 3.0, i had the same problem, what worked for me was:

app.UseRouting();
app.UseAuthentication();
app.UseAuthorization();

in StartUp.Configure method.

This doc shows typical ordering of middleware components: https://docs.microsoft.com/en-us/aspnet/core/fundamentals/middleware/?view=aspnetcore-3.0

At the request of others here is the answer:

The problem was with the middleware order in Startup.cs

public void Configure(IApplicationBuilder app, IHostingEnvironment env, ILoggerFactory loggerFactory)
{
    ConfigureAuth(app); // your authorisation configuration

    app.UseMvc();
}

Why middleware order is important? If we put app.UseMvc() first - then the MVC actions would get in the routing and if they see the Authorize attribute they will take control of its handling and that's why we receives 401 Unauthorized error.

I hope it helps someone ;)